FR2627430A1 - STOPPING THE MANUFACTURE OF A TIRE REINFORCEMENT FROM A SINGLE THREAD - Google Patents

Abstract

The reinforcement stop device 1 made from a single wire 4 essentially comprises two jaws 10, 11 pinching the wires arranged at the start 41, 42 and at the end 43, 44 of the reinforcement. A sharp blade cuts the wires then, without loosening the jaws, they are pressed against the core 7 to immobilize the wire 4 thanks to the layer of raw rubber with which the core 7 has been previously coated.

Description

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  STOPPING THE MANUFACTURE OF A REINFORCEMENT

  FOR TIRE FROM ONE SINGLE WIRE

  The present invention relates to the manufacture of tires. More particularly, it relates to a stage in the manufacture of a reinforcement from a single wire, according to the principle described in the patent application.

EP 243,851.

  According to the teaching of this patent application, the reinforcement for a tire is produced by hooking a continuous wire to two circles of wire retaining means so that a cylinder is thus defined by a plurality of goers and returns from one restraint to another. Then, by an appropriate movement of the retaining means, the wires are folded down over and around the core so that the reinforcement takes on, or begins to take its final place in the tire. But before folding, you must have isolated the wire from the unwinding means. This is the role of a head, illustrated in Figures 12 and 12a of the aforementioned application, said head ensuring the bonding of the last

  section of wire laid, to the first section of wire laid.

  The present invention aims to eliminate the use of glue when the unwinding of the wire is stopped. We use the self-adhesive properties of the wire used on the layer of

  raw rubber with the core previously coated.

  The device according to the invention comprises: 1) two jaws which can be inserted on either side of the strands of wire to be cut, then pinching the wire by bringing them towards one another in a movement parallel to the axis of said core, 2) a system for cutting the thread of the side of the jaws opposite to the core, 3) means for bringing said jaws together

  said core while holding them tight.

  The following figures help you understand

  the invention and seize all the advantages.

  Figure 1 illustrates the final phase of hanging the wire.

  Figure 2 is a plan view of the device.

  Figure 3 is an elevational view of the device.

  Figure 4 shows the application of the wire on the core.

  Figure 5 shows the control of a movement of the device.

  Of course, the term wire denotes here in general all the filiform elements usable to construct what is usually designated by carcass ply or crown ply. We see in Figure 1 the core 7 defining the

  shape of the inner surface of the tire to be manufactured.

  This core is coated with a layer of unvulcanized rubber. At the start, the wire 4 was introduced into the clamp 2 and was then hooked to the first retaining means 3 encountered by the rotary arm 5, the end of which has only been shown here so as not to unnecessarily overload the drawing. The segments 41 and 42 constitute the first section of wire 4 laid, according to the definition of the term section given in the aforementioned patent application in which one will find more details on the process and the apparatus for

  which the device of the present invention is used.

  At the end of this phase of manufacture, the rotary arm 5 is stopped on the side opposite to the clamp 2 and the wire 4 is in two straight sections 41 + 42 and 43 + 44 stretched and slightly inclined relative to one another. the other, intersecting at a point 40. Preferably, it is ensured that this point 40 is located substantially in the middle of the future tire, in the transverse direction. For this, one can give an adequate advance to arm 5 or one can

  activate a bar 50 to move the wire 4.

  The essential organ of the device is a pair of jaws and 11. These jaws 10 and 11 are inserted on either side of this crossing point 40, on the one hand between the segment 41 of the wire 4 attached to the clamp 2 and the segment 43 attached to the last retaining means 3 encountered by the arm 5, and on the other hand between the segment 44 joining the outlet orifice of the arm 5 and the segment 42 attached to the first retaining means 3 encountered by the arm at the start of this manufacturing phase. The device is designed and installed on the manufacturing apparatus so that the closing movement of the jaws is parallel to the axis of the core 7, that is to say approximately parallel to the bisector of the angle formed by the segments 41 and 43 of wire 4. The closing movement is shown diagrammatically in FIG. 1 by arrows in the vicinity of each of the jaws. In this way, after closing the jaws 10 and 11 (FIGS. 2 and 3), one finds on one side of these (core side 7), the segments 42 and 43 of the wire 4 also hooked to the retaining means 3 , that is to say those which must form part of the reinforcement of the tire. On the other side of the jaws, there are segments 41 and 44 respectively joining the clamp 2 and the arm 5, that is to say those

  that we do not want to incorporate into the reinforcement.

  On the side opposite to the core 7, a cutting system is implanted, constituted here very simply by a sharp blade 12

  moving along the jaws 10 and 11.

  After having cut the wires, the jaws 10 and 11 are approached from the core 7, without loosening them so as to maintain the segments 42 and 43 of the wire 4 until these are applied to the unvulcanized rubber, capable of retain them by membership. To this end, the jaws accompany the movement imparted to the entire reinforcement by the retaining means 3. The jaws are released when a sufficient length of the segments 42 and 43 of wire 4 (start and end of laying of the reinforcement) East

well applied to the core 7.

  The means used to ensure this approach include a counterweight 13, clearly visible in Figure 3, which allows, as soon as the jaws 10 and 11 are in contact with the cylinder 45 of sections of son 4, to accompany the decrease in diameter thereof at the start of the folding phase on and around the core 7. The jaws 10 and -4 11 are carried by a structure 14 whose approach and recoil movements relative to the core 7 are controlled by the 'Intermediate of a cable 15 wound around two return pulleys 16 and 17. The movement of the cable 15 relative to the piston of the jack 18 is free in one direction but blocked by a stop 19 in the other direction. This stop 19 is fixed on the cable 15, and the piston of the jack 18 presses on this stop 19 by means of the cleat 190 which also slides freely on the cable 15. For

  cause the approach, the piston of the jack 18 is raised.

  The effort required to advance the jaws 10 and 11 is due to gravity: the counterweight 13 is calculated so as to cause almost no deformation of the cylinder of wire sections 4, while ensuring, at the end of approach, sufficient support of the jaws 10 and 11 on the core. After opening the jaws, the distance is

  caused by the lowering of the piston of the jack 18.

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Claims (2)

  1. Device for stopping a reinforcement for a tire produced by hooking a continuous wire (4) to two circles of retaining means (3) of the wire (4) so that a cylinder is defined by a plurality back and forth from one retaining means to another, then by folding the wires (4) over and around a core (7), characterized in that it comprises 1) two jaws (10, 11 ) can be inserted on either side of the strands (41 + 42, 43 + 44) of wire (4) to be cut, then pinching the wire (4) by a movement parallel to the axis of said core (7), 2) a cutting system (12) for the wire (4) on the side of the jaws opposite the core (7), 3) means for bringing said jaws together   said core while holding them tight.   2. Device according to claim 1, characterized in that the means for bringing said jaws closer comprise a counterweight (13) which provides, by gravity, the force necessary for the advancement of the jaws (10 and 11) towards the core (7).